Dwyer Instruments 477 Operating Manual

Bulletin D-22

Series 477 Handheld Digital Manometer

Specifications - Installation and Operating Instructions

PECIFICATIONS

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ervice: Air and compatible gases.

S

etted Materials: Consult factory.

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Accuracy: ±0.5% F.S., 60 to 78°F (15.6 to 25.6°C);

±1.5% F.S. from 32 to 60°F and 78 to 104°F (0 to

15.6°C and 25.6 to 40°C).

Pressure Hysteresis: ±0.1% of full scale.
Pressure Limits: See chart.
Temperature Limits: 0 to 140°F (-17.8 to 60°C).
Compensated Temperature Limits: 32 to 104°F (-0 to

40°C).

Storage Temperature Limits: -4 to 176°F (-20 to 80°C).
Display: 0.42˝ (10.6 mm) 4-1/2˝ digit liquid crystal.
Resolution: See chart.
Power Requirements: 9 volt alkaline battery. Battery

included but not connected.

Weight: 10.2 oz (289 g).
Connections: Two barbed connections for use with 1/8˝

(3.18 mm) or 3/16˝ (4.76 mm) I.D. tubing. Two compres­sion fittings for use with 1/8˝ (3.18 mm) I.D. x 1/4˝ (6.35
mm) O.D. tubing for 477-6-FM & 477-7-FM only.

Agency Approvals: FM, CE.

Series 477 Digital Manometers are versatile, hand-held, battery operated manometers available in several basic

ranges from 0-20 in. H
±0.5% of full scale accuracy. You can select from up to nine common English and metric pressure units so conversions
are not necessary. A memory function allows storage of up to 40 readings for later recall and a backlight provides aux­iliary lighting for hard-to-see locations. Also standard are a hold feature plus both visual and audible overpressure
alarms.

Model*
477-000-FM
477-00-FM
477-0-FM
477-1-FM
477-2-FM
477-3-FM
477-4-FM
477-5-FM
477-6-FM
477-7-FM
477-8-FM

DWYER INSTRUMENTS, INC.

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O up to 0-150 psid. All models measure either positive, negative or differential pressures with

Range

0-1.000 in w.c.
0-4.000 in w.c.
0-10.00 in w.c.
0-20.00 in w.c.
0-40.00 in w.c.
0-200.0 in w.c.
0-10.00 psi
0-20.00 psi
0-30.00 psi
0-100.0 psi
0-150.0 psi

bar

.0498
.0996
.4982
.6895

1.379

2.069

6.895

10.34

psi

.1445
.3613
.7225

1.445

7.225

10.00

20.00

30.00

100.0

150.0

Available Pressure Units Maximum

kPa

.2491

0.996

2.491

4.982

9.96

49.82

68.95

137.9

206.9

689.5
1034

in w.c.

1.000

4.000

10.00

20.00

40.00

200.0

276.8

553.6

830.4
2768
4152

Phone: [phone] www.dwyer-inst.com

in Hg

.0736
.2942
.7355

1.471

2.942

14.71

20.36

40.72

61.08

203.6

305.4

mm Hg

1.868

7.473

18.68

37.36

74.73

373.6

517.1
1034
1551
5171
7757

mbar

2.491

9.96

24.91

49.82

99.6

498.2

689.5
1379
2069
6895

mm w.c.

25.40

101.6

254.0

508.0
1016
5080
7031

Pa

249.1
996
2491
4982
9964

Pressure

5 psig
5 psig
5 psig
10 psig
10 psig
30 psig
30 psig
60 psig
60 psig
150 psig
200 psig

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: [phone] e-mail: [e-mail]

INSTRUCTIONS

Battery Installation

he unit is shipped with a separate 9 volt alkaline battery which must be installed before operation. Remove the two

T

crews holding the bottom endcap in the place and remove it. Connect the battery to the enclosed battery clip observ-

s

ng correct polarity. Be careful not to trap wires between the battery, case or foam pads which retain the battery. This

i
could make it difficult to install the battery or remove it later for replacement. Be sure the rubber gasket is properly seat­ed in the gasket channel and replace endcap. Note that the endcap will only fit one way because the holes are slight­ly off-center. Place the “Z” shaped wrist strap clip in one of the screw recesses and replace the screws. Do not over­tighten. Attach wrist strap to clip.

hen battery replacement becomes necessary, use only a 9 volt alkaline type such as a Duracell

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22 or equivalent. Zinc-carbon types, often labeled Heavy-duty are not recommended because of the increased poten-

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N1604, Eveready

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tial for leakage. Alkaline batteries are also a better value because they last up to three times longer in this device.

On-Off Operation

The on-off control is a toggle function. Press the ON/OFF key once to turn unit on; again to turn it off. If the manome­ter is left on with no activity for approximately 20 minutes, unit will turn itself off to conserve the battery.

Display Backlight

The Model 477 includes a display backlight to allow use in the dark or in poor lighting conditions. Units must be
switched off before this feature can be activated. Next, press and hold the ON/OFF key down. After about 1 second
the backlight will come on and remain lighted for approximately 2 minutes after which it will turn itself off to conserve
battery life.

Zeroing Pressure Reading

Potential inaccuracy due to temperature effects can be minimized by re-zeroing immediately before use. To zero the
display, vent both ports to atmosphere so no pressure is applied to either port. Press the ZERO/STORE key and - - -

- will be momentarily displayed as zeroing occurs. Zeroing is not possible when the memory mode is in use. It must be
done before selecting that function.

If the unit is accidently zeroed with pressure applied to one of the ports, internal circuitry might detect an error and dis­play ALARM 1 or ALARM 2 at the top of the readout area. Additionally, if the ports are then vented, the audible over­pressure alarm may sound continuously. This will not normally cause harm it the maximum pressure has not been
exceeded. To correct the fault, vent the pressure ports to atmosphere and press the ZERO/STORE key to zero the unit.
The fault will then be corrected.

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